Patent GB-567110-A (GB)
Title: Improvements in or relating to yarn winding
IPC: B65H59/38
Filed: 1943-04-22
Abstract: 567,110. Winding yarns. KINSELLA, E. April 22, 1943, No. 6485. [Class 120 (ii)] A method of winding yarns at substantially constant linear speed comprises feeding the yarn to a rotating package, driving the package through variable speed means having speed control means associated therewith, driving the control means through a slipping drive and controlling the amount of slip therein in accordance with the divergence of the actual rate of growth of the package from an arbitrary preselected rate greater than the actual rate, whereby the peripheral speed of the package is maintained constant. The packagecarrying spindles 12, disposed on opposite sides of and above and below the axis of the trunnion casing 11, are driven by shafts 13, the speeds of which are controlled by infinitely variable gears 26, as described in Specification 526,628. Spinning pumps 39 operate with spinning cells 14 and a feed roller 15 to present threads 16 to the receiving carriers on the spindles 12. Arranged alongside 'the trunnion casing 11 is the traverse box 17 from which project the thread guides operated by cams 19 on shafts 20 driven by a common shaft 21. The main shaft 28 for the mechanisms within the gearbox 25 drives, through a gear train 29, 34, a sprocket 35 which through sprockets 36 drives the shafts 37, 38 operating the spinning pumps 39. The main shaft 28 also drives a sprocket 42 which drives the shaft 21 of the traverse box 17 and a ribbon-breaking device as in Specification 526,628. The end plate 44 is removable to allow of changing the gear train 34 to vary the speed of the pumps 39 and spindles 12 to produce yarns of different deniers. The mechanism for changing-over the trunnion casing 11 to present empty package-supports when the first group is filled, is as described in Specification 526,628. Each traverse guide frame 45 is connected to a rod 48 which is moved longitudinally as the packages grow to control the spindle speed through the gears 26. The trunnion casing 11 carries a worm gear 50 driven by a worm 51, at timed intervals, through a clutch 52, the drive to which comes from the main shaft 28 through sprockets and skew gears. Spring-urged pins 55 enter locking holes 56 to lock the trunnion casing in the two positions 180 degrees apart, the pins 55 actuating a lever 60, rocking about a pivot 61, to engage either one of clutches 31 to transmit drive from the main shaft 28 to the shafts 13 through the infinitely-variable gears 26. Each pin 55 passes through the lever 60 and acts on a lever 62 so that unlocking of the casing 11 may be effected without disturbing the lever 60. When a pin 55 moves into the corresponding hole 56, levers 60 and 62 are moved to engage one clutch 31 and disengage the other, the engagement taking place at once, but a time-lag operating for disengagement. The time-lag is effected by lever and dashpot mechanism which opposes disengagement. A cam 70, driven by a worm and worm-wheel 82, 83 from the main shaft 28 through a reduction train including a pawl-and-ratchet wheel, operates to disengage the operative pin 55 to allow rotation of the casing 11, while a master cam 71, comprising a slow lift and a sharp drop twice about its periphery, causes the roll-over clutch 52 to be engaged or disengaged. The time between engagement and disengagement of the clutch 52 is slightly more than that required to rotate the casing 11 through 180 degrees so that a slipping clutch 53 is provided in the drive from the roll-over clutch 52. The master cam 71 acts upon two spring-urged pivoted levers 88, 89 carrying adjustable detents 86, 87, the levers 88, 89 being pivoted to links 93 which move a rocking lever 95 and a bell-crank 96, 97 which operates the roll-over clutch 52. The detents 86, 87 are separated by an angle less than 180 degrees so that when either one is " dropped " by the cam 71 the bell-crank 96, 97 is turned, but throughout the winding of a package both detents bear on the slow lifts of the cam 71 and nb operation of the roll-over clutch 52 takes place. The speed of the infinitely-variable gears 26 is controlled by a speed cam 103 which moves spring-loaded plungers 101 to lessen the speed rate as the package grows. The speed cam 103 has a dwell for 180 degrees, at minimum radius, and then a slow rise for 180 degrees followed by a sudden drop to minimum radius. Secured to the shaft 72 is a cam 104, which comprises two slow rises and two sudden drops per revolution, for the control of the driven member 105 of a clutch 105, 106, the driving member 106 of which is under the control of the rod 48, moved longitudinally by the growing packages. The driven member 105 carries a worm 107 which drives a worm gear 111 keyed to the shaft 72 so that the cams 103, 104 are rotated thereby. The driving member 106 of the clutch is rotated from the shaft 112, which carries the sprocket 35 driving the spinning pumps 39, through gears 115, 116. The driven member 105 is controlled by a lever 117, engaging the cam 104, which steadily draws the member 105 away from the member 106 during the winding operation. The end of the shaft 120, upon which members 105, 106 rotate, projects outside the gear-box 25 and is engaged by a spring-loaded lever 121 also acted upon by the rod 48. The effect of the clutch 105, 106 is therefore to drive the cams 103, 104 at a rate, lower than that at which the clutch member 106 rotates, and automatically adjusted in accordance with the actual rate of growth of the packages. The form of the speed cam 103 is such that, if constantly driven at the maximum speed of the member 106, it would decrease the spindle speed at a rate greater than the expected rate of growth of the package. Thus, if the packages tend to grow at a faster rate than expected, the clutch members 105, 106 will be pressed more tightly together, thus giving the cams 103, 104 a faster rate and diminishing the spindle speed to give a constant take-up. The cams 103, 104 are re-set, in preparation for the next cycle, by a worm gear 125, connected thereto by a freewheel gear, the gear 125 being driven through clutches 128, 129 from the shaft 112. The clutch 128 is a slipping clutch and the clutch 129 is actuated by a lever system 130, 132, 133 from the lever 117 actuated by the cam 104. When the lever 88 is dropped by the cam 71, to effect change-over at the end.of a cycle, a connection from lever 88 operates the re-setting clutch 129 providing the lever 117 is at its extreme lifted position. This latter is brought about by a lever 100 operated by a cam groove 99 on the trunnion casing 11. The lever 100 brings the clutch member 106 into firm engagement with the member 105 to effect movement of the lever 117 to its extreme position in which it is retained by a spring-loaded hook 140, carried by the lever 117, engaging a stationary pin 141. The cam 104 normally acts upon the lever 117 through a lever 142, pivoted thereto, which presses against a pin 144 on the lever 117. When the lever 117, however, is moved to its extreme position by the lever 100, the hook 140 presses the lever 142 into engagement with the cam 104 until the rotation thereof brings a stop 150 on the cam 104 into engagement with a stop 151 on the lever 142. The lever 142 is then dropped by the cam 104, having released the hook 140, so that both levers 117, 142 return to their inward position ready for the next cycle. At the same time the speed cam 103 permits the plunger 101 to move the gears 26 to the maximum speed position. The gear 111 is also provided with a free-wheel arrangement to allow of resetting of the cam-shaft 72. To permit of change-over manually, the shaft 81 carrying the worm 82 may be rapidly rotated at any time by a handle 84.